Johnnie Baston on Thursday became the first person in the United States executed with the single-dose drug pentobarbital.

Pentobarbital, a barbiturate that has been used in animal euthanasia and as a mild anesthetic in humans, was used in a U.S. execution for the first time in December, when it was administered as the first drug in a three-drug cocktail used in a lethal injection given to an Oklahoma inmate.

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